From
the wiki page for Succor:
Quote:
Drains a total of 1025 mana from the caster. Use Egress if you are solo and only evacuating yourself.
Also drains 750 mana from group members. Decreased mana of entire group, including caster, by 750 (not 150) until Luclin. [1]
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In other words, the spell only "costs" 350, but an effect of the spell (successfully) being cast is that everyone in the group loses 750 on top of that.
The whole idea of succor was not to cross West Karana quickly, it was to get your group out of a dangerous situation before anyone died. The devs considered the mana "tax" to be a fair side effect (of saving your life).